Re: git status: small difference between stating whole repository and small subdirectory

On Mon, Feb 20, 2012 at 09:16:43PM +0700, Nguyen Thai Ngoc Duy wrote:

On Mon, Feb 20, 2012 at 9:06 PM, Jeff King [off-list ref] wrote:

quoted

Interestingly, on my git.git repo, I had an empty cache. Running "git
read-tree HEAD" filled it (according to test-dump-cache-tree). It seems
that running "git checkout" empties the cache.  So perhaps git could do
better about keeping the cache valid over time.

For fast forward case when result index matches 100% destination tree,
yeah we should repopulate cache-tree. "git reset" does that. Not sure
about other cases though. I don't think we can keep track what
subtrees are unchanged after unpack_trees() in order to keep them.

Yeah, doing it after unpack_trees seems crazy. But I really feel like
unpack_trees should be able to handle cache updates as it unpacks. It
knows what is being updated and what is being merged. But maybe it is
more complicated than that; I haven't looked at the code yet.

-Peff